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Flow Chart of Troubleshooting
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9-11
PAM400 pin 3,16(VDD)
= 3.7V?
Speaker does not work
U303 and U304
(analog Switch) pin 5
≒ 3.7V?
Resolder U303, U304 and U402
No
Yes
No
Resolder or replace PAM400 and
U402
Yes
Does Speaker Receive
The Signal from PAM400
(Audio AMP) ?
Resolder R307, R308, C312, C313,
C314, and C315
No
Yes
END
Yes
Is Speaker working?
Change the Speaker
No
Yes